<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .content>p{
            color:red;
        }
        .content p{
            background-color:blue;
        }
    </style>
</head>
<body>
    <div class="content">
      <p>hello world</p>
      <ul>
          <li>hello world</li>
          <li>hello world</li>
          <li>
              <p>hello world</p>
              <p>hello world</p>
          </li>
      </ul>
      <p>你好</p>
    </div>
</body>
</html>